Machine for forming loops on coil-springs.



C. R.- ARRBTT.

' Bayr AvAmLB COPE; MACHINE POR FORM-3f, Loops 0N COILSPRINGS.' 1

nrmolnlo Hmm 1113.13, 1909. Y

,Patented Sept. 27, 1910.

- CHARLES n. BARRETT, or CHICAGO," ILLINOIS. l

MACHINE FOR FORMINGLOPS ON COIL-SPRINGS;

Specification of Letters Patent. i linten tod Stpf. 17, 191

Application ied February 13,' 1909. Serial No. 477,755.

To all wwnrit may` concern:

Be it known thatV I, CHARLES R. BARRETT,

y a citizen of the United States of America,

and a resident of Chicago, in the county of (Took and State of'Illinois, have invented certain new aiidusefiil Improvements in Machines for Forming Loops Springs, of which the following is a speci- ',cation. 10

This invention relates to a mechanism for forming attaching loops or eyeson the ends y ofcoiled wire springs,v and has for its object .to provide a simple and eiicieiitl mechanism `1 is a front elevation.,illustrating the general arrangement of the mechanism. Figs. 2, 3, and l are detail elevationsshowing the different. steps in the formation of the loop or eye on the end of a spring. Fig. is a detail perspective view of a coiled spring onwhich attaching loops have been formed-by the mechanism. y

Similar numerals of reference indicate like parts in the several views.

Referring to the drawings, 1 represents the supporting frame or standard having a bearing iii which turiisthe main shaft or arbor 2 of the mechanism, said shaft receiving motion through a gear wheel 3, or the like, from a suitable power source.

4 is a hub secured to the arbor 2, near its forward end vand provided with a radial bending jaw 5, which has traveled in a circular path and has its forward end made acute as shown in order to more effectively engage an end convolution of the spring operated on in bending said convolution into an attaching loop in a manner hereinafter more fully set forth.

6 is vthe work-supporting head of the mechanism and upon which the end of the coiled spring is supported in the manner hereinafter set forth during the loop forming operation. The main body of said head is carried by the main frame and is made adjustable thereon by a holding bolt 7, and segmental slot 8, so that the position of the hereinafter described restA and anvil bars may be changed with relation to the bending jaw 5, to present. the endof the coiled spring operated on in a direction best suited to the formation of a perfect loop, the degree of on Coil-y such adjustment depending mainly on the resiliency of the metal inthe spring. A

9 is n rest piece or bar adjnstably held by the afer id supporting head G, and formed with a .straightl resting face for the coiled ENT orrion.

spring operated on. Said face is in a plane tangential to thel circular path of the bending jaw 5, aforesaid, and as shown in Figs. 1. 2, 3 and 4. 10 is an anvil piece or bar also adjustably. held by the aforesaid supporting head 6 in parallel relation to thev rest bar 9 aforesaid and `formed with a ciirved anvil end in adjacent relation to the circular path ofthe bending jaw 5, and constitutiiig a breast over which the loop of thev coiled spring is bent, as well as aA stop for the end or said spring to insure its proper position in the apparatus. Y

l1 and l)- are adjusting screws by' which limited adjustment is imparted to the respective bars 9 and 10 aforesaid.

13 is a rock lever fulcrumed on the arbor 2 aforesaid. One end 01"' said lever has a position above the aforesaid rest bar 9 aiidis formed with a holdingeye 1l, in which is secured a detachable jaw i'which as said end o f the lever is depressed bears upon the coiled spring to hold the saine firmly iii place while the bending jaw 5 is forcing an end convolution of the spring into anangular relation to the body of vthe spring to constitute an attaching loop or c ve. 1G is an adjustable connecting rod extending from the opposite end of the aforesaid rock lever 13 to a rock arm 17 secured to a couiitershaft. 18 journaled in the upper end of the frame or standard 1, as shown in Fig. 1. y

19 is a secondary arm carried by the countershaft 1S, aforesaid.

20 is a cani carried by the arbor il and engaging the free end of the secondary arm 19, to impart '.;.c.ement to the holding jaw 15, through the intermediate connection above described. at intervals during the operation of the apparatus.

21 is a spring extending from the rock lever 13 to the main frame 1 and adapted t0 impart movementto said lever in a direction opposite to that imparted by the aforesaid cain 20.

In the operation ofthe mechanism, the coiled spring to be looped is placed on the rest iar 9 with it.; end abutting against the amil bai.' 10. lVith the continued rotation of the arbor Q, the cam 20 rocks the lever 13 to bring its holding jaw 15 down apon the `spring to rinlv clamp the saine in position.

lVhile so heldfthc bending jaw 5 in its circular travel engages the end convolution of the Spring to bendthc same over the anvil into a substantially right-angle relation to the body ot' the spring and forni the required attaeli'ng loop or c ve, shown. Continued rotation of the arbor 2 releases the holding jaw 15, from its grip Aon the coiled spring, so that-thc saine may be removed and replaced by another spring for a repetition of the above operations.

Having thns folly described mysaid invention what I claim as new and Vdesire to secure b v Letters Patent, iszl. Mechanism for forming loops on coil springt, comprising a bending jaw having continuons movement in a circola r path, and an anviland a restarranged in adjacent tangential relation to the circular path of said bending jaw, substantially as set forth. '2. Mcdianism for forming loops on coil springs, comprising a rotar)Y bending jaw the point of which moves in a circular path,

` an anvil and a rest arranged .in adjacent tangential relation to the circular path of the bending jaw, a holding jaw adapted to hold a coil spring onsaid rest, and means` for moving said holding jaw into and ont of engagement with said coil spring, substantially as set forth.

3. Mechanism for forming loops on coil springs, comprisinga rotary bending jaw the-point olr which moves in a circular pathan anvil and a rest. arranged in adjacent tangential relation to the circular path 'of the bendingjaw, and means for adjusting j the tangential relation of said anvil and rest, t

substantially as set forth.

4. idechanisni' for forming loops on coil springs, comprising a rotary bending jaw the point of which moves in a circular path, an anvil and a rest arranged in adjacent tangential relation to the circular path ofthe bending jaw, a holding jaw adapted to hold a coil spring on said rest, means fori moving said holding jaw into and ont of engagement with said coil spring, and means i for adjusting the tangential relation of said anvil and rest, substantially as set forth.

5. In a mechanism for forming loops on coil springs, the combination of a supporting frame, an arbor jonrnaled in said frame, a bending jaw rotating with said arbor with its point moving in a circular path, a head secured tothe supporting frame, a rest bar and an anvil bar secured in adjacent relation on said head and in tangential relation to the circular path of the bending jaw, substantially as set forth.

6. In a mechanism for vforming loops on coil springs, the combination of a supporting frame, an arbor journaled in said frame, a bending jaw carried by said arbor and moving in a circnlarpath, ahead secured to the supporting frame, a rest bar and an anvil bar secured in adjacent relation on said head and Vin tangential relation to' the circular path of thc bending jaw, a holding jaw, a roclrlever fulcrumed on the arbor and carrying said holding jaw, Va conntershaft, arms on said conntershaft, a. connection between one of said arms and the rock lever, a cani on the arbor engaging the other arm of the conntei'shaft, and a spring imposing movement` on the rock lever in a direction opposite to that imposed by the cam, snbstanyso tiall;7 as set forth.

7. In a mechanism for forming loops on f coil springs, the combination of a supporting frame, an arbor joninaled in `said frame, a bending jaw carried by said arbor and moving in a circular path, a head secured to the supporting frame, means for el'l'ecting an adjustment of said head with relation to the circular path of the bending jaw, the same comprising in part an attaching bolt and segmental slot. a rest bar and an anvil bar secured in adjacent relation on said head, substantially as set forth.

8. In a mechanism for forming loops on coils springs, the combination of a supporting frame, an arbor jouinaled in said frame,y

a bending jaw carried by said arbor and moving in a circular path, a head secured to the supporting frame. means for effecting an adj ustinent of said head with relation to the circular path of the bending jaw, a rest bar and an anvil bar secured in adjacent relation on said head, a holding jaw, a rock lever fnlcrnnied on the arbor and carryingr said holding jaw. a cminteishrtt, arms on said conntershatt. a connection between one of said arms and the rock lever, a cam on the arbor engaging the other arm of the countersliaft, and a spring imposing movement on the rock lever in'a direction opposite to that imposed by the cam, substantially as set forth.

Signed at Chicago, Illinois, this 11th day .t

of February 1909.

CHARLES R. BARRETT.

Vitnesses ROBERT BURNS, HENRY Mon. 

